linux-kernel - Re: [RFC PATCH 18/32] function_graph: Fix to initalize ftrace_ops for fgraph with ftrace_graph

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Date:   Mon, 6 Nov 2023 19:04:16 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Florent Revest <revest@...omium.org>,
        linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alan Maguire <alan.maguire@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Guo Ren <guoren@...nel.org>
Subject: Re: [RFC PATCH 18/32] function_graph: Fix to initalize ftrace_ops
 for fgraph with ftrace_graph_func

On Mon,  6 Nov 2023 01:10:10 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Fix to initialize the ftrace_ops of fgraph_ops with ftrace_graph_func
> instead of ftrace_stub.

I've changed this, because fprobe entry handler is not called via
fgraph without this. But maybe I have to set correct gops->ops.func
after init?

Thank you,

> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> ---
>  kernel/trace/fgraph.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
> index 597250bd30dc..858fb73440ec 100644
> --- a/kernel/trace/fgraph.c
> +++ b/kernel/trace/fgraph.c
> @@ -872,7 +872,7 @@ unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
>  void fgraph_init_ops(struct ftrace_ops *dst_ops,
>  		     struct ftrace_ops *src_ops)
>  {
> -	dst_ops->func = ftrace_stub;
> +	dst_ops->func = ftrace_graph_func;
>  	dst_ops->flags = FTRACE_OPS_FL_PID | FTRACE_OPS_FL_STUB;
>  
>  #ifdef FTRACE_GRAPH_TRAMP_ADDR
> @@ -1120,7 +1120,7 @@ int register_ftrace_graph(struct fgraph_ops *gops)
>  
>  	if (!gops->ops.func) {
>  		gops->ops.flags |= FTRACE_OPS_FL_STUB;
> -		gops->ops.func = ftrace_stub;
> +		gops->ops.func = ftrace_graph_func;
>  #ifdef FTRACE_GRAPH_TRAMP_ADDR
>  		gops->ops.trampoline = FTRACE_GRAPH_TRAMP_ADDR;
>  #endif
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>